Suction brush for vacuum cleaner

Abstract

A suction brush for a vacuum cleaner is provided. The suction brush includes an upper casing; a lower casing; an elevating plate installed between the upper casing and the lower casing; a cleaned surface sensing part for sensing; a lever rotatably provided around a rotating shaft that is parallel to the elevating plate; and a solenoid. The solenoid rotates the lever in one direction when the surface to be cleaned is the hard floor and rotates the lever in the other direction when the surface to be cleaned is the carpet. The lower casing contacts the surface to be cleaned as the elevating plate descends, while it comes apart from the surface to be cleaned as the elevating plate ascends.

1. A suction brush for a vacuum cleaner, comprising:
 an upper casing; 
 a lower casing fixedly coupled to the upper casing and having a suction port, formed thereon, for drawing in dust and other foreign materials existing on a surface to be cleaned; 
 an elevating plate installed between the upper casing and the lower casing so as to ascend and descend against the lower casing and having a lever insertion part formed thereon; 
 a cleaned surface sensing part for sensing whether the surface to be cleaned is a hard floor or a carpet; 
 a lever rotatably provided around a rotating shaft that is parallel to the elevating plate, one end of the lever being inserted into the lever insertion part and pressing the elevating plate downward when the lever is rotated in one direction, while one end of the lever seceding from the lever insertion part when the lever is rotated in the other direction; and 
 a solenoid for rotating the lever in one direction when it is sensed that the surface to be cleaned is the hard floor and rotating the lever in the other direction when it is sensed that the surface to be cleaned is the carpet; 
 wherein the lower casing becomes in contact with the surface to be cleaned as the elevating plate is descending, while it comes apart from the surface to be cleaned as the elevating plate is ascending. 
 
   
   
     2. The suction brush of  claim 1 , wherein the lever comprises:
 a center part through which the rotating shaft passes; 
 a connection part formed to extend from one side of the center part and connected to the solenoid; and 
 an elevating plate pressing part formed to extend from the other side of the center part and detachably inserted into the lever insertion part. 
 
   
   
     3. The suction brush of  claim 2 , wherein the solenoid comprises:
 a solenoid main body; 
 a plunger driven in a straight line by the solenoid main body; and 
 a connection pin coupled to one end of the plunger in a direction perpendicular to the plunger and connecting the plunger to the connection part of the lever; 
 wherein the connection part of the lever comprises a guide groove through which the connection pin passes and which guides sliding of the connection pin. 
 
   
   
     4. The suction brush of  claim 2 , wherein the elevating plate pressing part further comprises a support shaft having one end inserted into the center part of the lever, the support shaft supporting the lever as it rotates together with the lever. 
   
   
     5. The suction brush of  claim 1 , wherein the cleaned surface sensing part comprises:
 a fixed plate horizontally kept at a specified height from a bottom of the surface to be cleaned; 
 a micro switch arranged on an upper part of the fixed plate; and 
 a rotating member installed on the fixed plate to have a rotating shaft that is parallel to the fixed plate and having a cleaned surface contact part, provided on one end thereof, for being in contact with the surface to be cleaned and a switch contact part, provided on the other end thereof, for being in contact with a contact terminal of the micro switch. 
 
   
   
     6. The suction brush of  claim 1 , further comprising a power supply part for supplying a power to the solenoid.